Drilling-machine.



N. D. LEVIN.

DRILLING MACHINE. APPLICATION FILED NOV. 1a, 1906. RENEWED, JULY 28, 1909 Patented May 24-, 1910 4BHEBTB-SHBET 1.

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DRILLING MACHINE, APPLIOATIOR FILED NOV. 19, 1906. EBNEWED JULY 28, 1909.

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N, DJLEVIN.

I DRILLING MACHINE. APPLICATION FILED NOV. 19, 1906. RENEWED, JULY 28, 1909.

Patented May 24, 1910.

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DRILLING MACHINE.

APPLIOATION FILED NOV. 19

, 1906. RENEWED JULY 28, 1909.

4 SHEETS-SHEET 4.

INVENTOR Patented May 24, 1910.-

NILS DAVID LEVIN, OF CHICAGO, ILLINOIS.

DRILLING-MACHINE.

Specification of Letters Patent.

Patented May 24, 1910.

Application filed November 19, 1906, Serial No. 343,964. Renewed July 28, 1909. Serial No. 509,979.

To all whom it may concern:

Be it known that I, NILs DAVID LEVIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drilling-Machines, of which the following is a specification.

My invention relates to drilling machines and has for its objects; to provide a power operated machine of this character in which air pressure is utilized to drive the pick in a new and advantageous manner; to provide a drilling machine in which the operating parts are air cushioned and more durable than in other machines of this general type; and finally to provide a machine of greater simplicity and increased eiiiciency. These and other objects are accomplished by my invention, certain forms of which are shown in the accompanying drawings in which,

Figure 1 is a plan view of one form of the machine,

Figure 2 is a side elevation thereof,

Figure 3 is a longitudinal section,

Figure 1 is a longitudinal section through another form of machine,

Figure 5 is a longitudinal section through the machine of Figure 1, slightly modified,

Figure 6 is a cross section on the line VIVI of Figure 5, and

Figure 7 is a sectional plan view of a modification.

My invention is design-ed primarily for mining coal and rock drilling although it is apparent that it might be utilized for other purposes and belongs to that type of portable machines 'in which the power is supplied by a motor carried directly on the machine. In the present case such motor is shown as an electric one but it will be apparent that other forms of portable motors might be substituted if desired. A speed reducing mechanism is provided intermediate the motor and the reciprocatory parts, and a reciprocatory piston and cylinder mechanism is utilized to provide a pneumatic drive and to cushion the parts.

Referring now to the machine of Figures 1, 2, and 3, which machine is designed for mining coal and is known as a pick machine, 1 is the casing of the machine, 2 is an electric motor mounted upon the top of the casing, 3 are the wheels upon either side of the device (shown in Figure 1) to secure easy movement from place to place, 4 is the crank from which the reciprocatory parts are driven, 5, 6, and 7 are the speed reducing gears for driving the crank shaft 7' from the motor 2, 8 is a connecting rod pivoted, as shown in Figure 3, to the crank 4 at one end and to the cylinder 9 at the other end, 10 is the piston, 11 is the piston rod secured thereto, 12 is the tool, and 13 is the usual connecting means between the piston rod and the tool. The cylinder 9 is closed at both ends as will be seen from Figure 3, and is provided at its forward end with a series of ports 14, while the casing 1 is provided with a similar series of ports 15 arranged to uncover the ports 14 near the forward end of the stroke of the cylinder. In order to keep out dirt and other foreign matter, the ports are screened as indicated in Figures 1 and 2. The ports 15 also serve as a means for the introduction of oil from the pipe 16, which pipe 16 leads from the oil receptacle of the motor, and this pipe secures not only the lubrication of the coacting surfaces of the cylinder and casing, but also of the surfaces of the piston and cylinder. The casing 1 is also provided with longitudinal slots 1'? on either side thereof, which slots are adapted to receive the projecting members 18 integral with the collar 19, which collar 19 is keyed to the piston rod 11. The projecting members 18 constitute guides to keep the tool from turning.

The operation of the machine is as follows:

Assuming that the cylinder is on its forward stroke, the air behind the piston is somewhat compressed because of the inertia of the piston, which causes it to la g behind the rapid movement of the cylinder, and when the cylinder reaches its forward extreme of movement such compression behind the piston accentuates the forward impetus of the piston, causing the tool to strike a sharp blow. After the front edge of the piston has passed the front edge of the port 14, further movement thereof is retarded by the air pressure between the front side of the piston and the end of the cylinder. When the cylinder is being reversed from the forward to its backward stroke, the piston will be stationary after the tool has struck the material being worked, until the cylinder be moved sufliciently to compress the air in the front end of the cylinder, and at the same timeuncover theback end of the ports 14, thus allowing a replenishing of the air in the cylinder to compensate for leakage. The

piston is pulled rearwardly as the cylinder retreats by virtue of the air compressed in front thereof. The piston in the movement acquires the speed of the cylinder, and as the cylinder comes to a stop at its rearmost position, the movement of the piston causes it to continue its rearward movement, com pressing the air in the cylinder. On the forward movement of the cylinder this compression is increased and the cycle as above described repeated. It will be apparent from the foregoing that the arrangement of the mechanism provides for an effective utilization of stored up pneumatic power at the moment of striking, and that the arrangement also provides for the air cushioning of the reciprocatory parts thereby rendering the machine more durable and convenient of manipulation. It will also be apparent from inspection that the arrangement of piston and cylinder may be reversed although not so desirable in this form, which modification and others which will readily occur to those skilled in the art are comprehended by my invention and are intended to be covered by the claims.

In Figure 1 I have illustrated another form of the machine adapted particularly for rock drilling. This machine has amotor and reducing mechanism (not shown) of substantially the same form as is shown for the machine of Figures 1, 2, and 3, but cliffers otherwise in having a mechanism for revolving the drill as opposed to the construction of the pick machine in which the members 18 prevent any rotation of the drill. Referring to the drawing, 20 is the drive wheel corresponding to the drive wheel of Figure. 1, 21 is the cylinder operated from the crank 22, 23 is the piston, 24E is the piston rod provided with a keyed engagement with the drive gear 25, 26 is a drive shaft carrying at one end the gear 27 meshing with the gear 25 and at the other end the bevel gear 28 meshing with the bevel gear 29 on the end of the crank shaft, and 30 is a cap for holding the gear 2 1 in place. It will be apparent that this arrangement provides for the rotation of the tool as it reciprocates back and forth.

In Figures 5 and 6 I have shown the pick machine of Figures 1, 2, and 3, but differing therefrom in that the machine is supplied with a device for regulating the force of the blow. This device comprises a sliding coverplate adapted to be moved to cover any desired number of the ports 15 in the casing 1, thus varying the freedom with which the air can escape from the front side of the piston 10 when the ports 14 in the cylinder register with the ports 15. As shown in the cross sectional view of Figure 6 the ports 15 are distributed about only a portion of the circumference of the casing 1 and are adapted to be covered by the semicircular cover plate 31 which cover plate is guided by the guides 32 (Figure 5) and has upon its rear side the rack 33 by which the plate is moved to cover a greater or less number of the ports 15. Meshing with this rack 33 is a pinion 34: carried by a rod 35 extending to the wheel 36 in position to be engaged by the operator. The shaft is supported by suitable brackets extending from the casing of the machine. It will be apparent without further explanation that the position of the cover plate 31 will: govern the forceof the blow. In Figure 7 I have illustrated a still difi'erent regulating arrangement which differs from the one of Figures 5 and 6 in that the port is a single one of greater width than those of Figures 5 and 6 and such port 37 extends diagonally about the casing, so that by moving the cover plate 38 a greater or less port area will be exposed, the result accomplished being the same as that accomplished by the regulator of Figures 5 and 6.

Having-thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is the following:

1. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided. with an airport intermediate its ends, guide means for the cylinder adapted to confine the air in the front portion of the cylinder during the first portion of its forward. stroke and release it at the latter portion of the forward stroke, a reciprocable piston, a tool carried by one of such parts, and means reciprocating the other part.

2. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port near its forward end, guide means for the cylinder adapted to confine the air in the front portion of the cylinder during the first portion of its forward stroke and release it at the latter portion of the forward stroke, a reciprocable piston therefor, a tool carried on the piston, and means for reciprocating the cylinder.

3. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port located at a distance from the front end sufficient to prevent the piston from striking the front end of the cylinder, guide means for the cylinder adapted to confine the air in the front portion of the cylinder during the first portion of its forward stroke and release it at the latter portion of the forwardstroke, a reciprocable piston, a tool carried by one of such part-s, and means for reciprocating the other part.

1. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port located at a distance from the front and sufficient. toprovide an air cushion toprevent the piston from striking the front end of the cylinder, a reciprocable piston therefor, guide means for the cylinder adapted to confine the air in the front portion of the cylinder during the first portion of its forward stroke and release it at the latter portion of the forward stroke, a tool carried by the piston, and means for reciprocating the cylinder.

5. In combination in a drilling machine, a reciprocable cylinder having its end closed and provided with an air port adapted to maintain atmospheric pressure in the front part of the cylinder on the forward stroke thereof and secure an air cushion between the front end of the cylinder and the piston, guide means for the cylinder adapted to confine the air in the front portion of the cylinder during the first portion of its forward stroke and release it at the latter portion of the forward stroke, a reciprocable piston, a tool carried by one of such parts, and means for reciprocating the other part.

6. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port intermediate its ends in position to provide for the cash ioning of the piston on its forward stroke and to permit of the restoring of the air behind the piston to atmospheric pressure, guide means for the cylinder adapted to confine the air in the front portion of the cylinder during the first portion of its forward stroke and release it at the latter portion of the forward stroke, a reciprocable piston, a tool carried by one of such parts, and means for: reciprocating the other part.

7. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port intermediate its ends, a reciprocable piston therefor, a tool carried by one of said parts, means for reciprocating the other part, and a casing for the cylinder provided with an air port in position to uncover the air port in the cylinder toward the end of the forward stroke thereof.

8. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port intermediate its ends, guide means for the cylinder adapted to confine the air in the front portion of the cylinder during the first portion of its forward stroke and release it at the latter portion of the forward stroke, a reciprocable piston, a tool carried by one of said parts, means for reciprocating the other part, a casing for the cylinder, and means for preventing the tool from turning.

9. In combination in a drilling machine,

a reciprocable cylinder having its ends closed and provided with an air port intermediate its ends, guide means for the cylinder adapted to confine the air in the front portion of the cylinder during the first portion of its forward stroke and release it at the latter portion of the forward stroke, a reciprocable piston therefor, a tool carried by one of said parts, means for reciprocating the other part, a casing provided with a longitudinal slot, and a projecting member on the part carrying the tool fitting the said longitudinal slot for preventing the turning of the tool.

10. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port intermediate its ends, a reciprocable piston therefor, a tool carried by one of said parts, means for reciprocating the other part, a casing for the cylinder provided with an air port in position to uncover the air port in the cylinder on the forward stroke thereof, and means for varying the amount of port opening in the casing.

11. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port intermediate its ends, a reciprocable piston therefor, a tool carried by one of said parts, means for reciprocating the other part, a casing for the cylinder provided with an air port in position to uncover the air port in the cylinder on the forward stroke thereof, a cover plate slidable over the port in the casing, and means for operating the cover plate so that the amount of port opening may be varied.

12. In combination in a drilling machine, a reciprocable cylinder having its ends closed and provided with an air port intermediate its ends, a reciprocable piston therefor, a tool carried by one of said parts, means for reciprocating the other part, a casing for the cylinder provided with an air port in position to uncover the air port in the cylinder 011 the forward stroke thereof, a cover plate slidable over the port in the casing, and means operable from the rear part of the machine for moving the cover plate so that the amount of port opening may be varied.

In testimony whereof, I hereunto sign my name in the presence of the two subscribed witnesses.

NILS DAVID LEVIN.

Witnesses JAMES NICHOLAS LORENZ, J AY HARRISON BROWN. 

